The Microscope. 



'293 



A uniform thickness of cover-glass for unadjustable objectives 

 -seems also desirable; then by the use of some cover-glass measure, 

 like the one made by Zeiss, the microscopist could select covers of 

 the proper thickness to be used for the specimens to be studied with 

 unadjustable objectives. 



Cornell University. 



A NEW MATERIAL CABINET. 



A. L. HOLDEN, M. D. 



A VERY artistic and inexpensive material cabinet can easily be 

 -*■ -^ constructed in the following manner. It consists of three tin 

 or wooden boxes, of equal height, with flat covers, varying in 

 diameter from 1| inches to 3f inches. Take the largest, and fasten 

 to the bottom a circle of wood or metal, -iih inches in diameter and 

 I inch in thickness. The projection will form a rest for the vials, which 

 are held in position by a rubber band placed around each box. The 

 next smaller box, 2f inches in diameter, should be fastened to the 

 cover of the largest, and so on. The interior of the boxes form a 

 receptacle for packets of dry material. 



/ r 1^. 



If painted a light color, the objects in the vials will be easily 

 seen, and, when finished, it makes a useful ornament for the micros- 

 copists' table. 



Utica, N. Y. 



